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SubjectRe: [PATCH v2 1/3] drm/i915: Move the code to populate ACPI device ID into intel_acpi
Hi Jani,

Thanks for the review.

On Wed, Nov 20, 2019 at 6:41 AM Jani Nikula <jani.nikula@linux.intel.com> wrote:
>
> On Mon, 04 Nov 2019, Rajat Jain <rajatja@google.com> wrote:
> > Move the code that populates the ACPI device ID for devices, into
> > more appripriate intel_acpi.c. This is done in preparation for more
> > users of this code (in next patch).
>
> I don't think your use of the code makes sense (I'll explain in reply to
> the other patches)

OK, I'll discuss this there.

> but I could be persuaded to move the code to
> intel_acpi.c.
>
> > Signed-off-by: Rajat Jain <rajatja@google.com>
> > Change-Id: Ifb3bd458734985c2a78ba682e6f0a2e63e0626ca
>
> Please drop Change-Ids.

Done.

>
> > ---
> > v2: v1 doesn't exist. Found existing code in i915 driver to assign the ACPI ID
> > which is what I plan to re-use.
> >
> >
> > drivers/gpu/drm/i915/display/intel_acpi.c | 87 +++++++++++++++++++
> > drivers/gpu/drm/i915/display/intel_acpi.h | 6 ++
> > drivers/gpu/drm/i915/display/intel_opregion.c | 80 +----------------
> > 3 files changed, 97 insertions(+), 76 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c b/drivers/gpu/drm/i915/display/intel_acpi.c
> > index 3456d33feb46..748d9b3125dd 100644
> > --- a/drivers/gpu/drm/i915/display/intel_acpi.c
> > +++ b/drivers/gpu/drm/i915/display/intel_acpi.c
> > @@ -156,3 +156,90 @@ void intel_register_dsm_handler(void)
> > void intel_unregister_dsm_handler(void)
> > {
> > }
> > +
> > +/*
> > + * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
> > + * Attached to the Display Adapter).
> > + */
> > +#define ACPI_DISPLAY_INDEX_SHIFT 0
> > +#define ACPI_DISPLAY_INDEX_MASK (0xf << 0)
> > +#define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4
> > +#define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4)
> > +#define ACPI_DISPLAY_TYPE_SHIFT 8
> > +#define ACPI_DISPLAY_TYPE_MASK (0xf << 8)
> > +#define ACPI_DISPLAY_TYPE_OTHER (0 << 8)
> > +#define ACPI_DISPLAY_TYPE_VGA (1 << 8)
> > +#define ACPI_DISPLAY_TYPE_TV (2 << 8)
> > +#define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8)
> > +#define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8)
> > +#define ACPI_VENDOR_SPECIFIC_SHIFT 12
> > +#define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12)
> > +#define ACPI_BIOS_CAN_DETECT (1 << 16)
> > +#define ACPI_DEPENDS_ON_VGA (1 << 17)
> > +#define ACPI_PIPE_ID_SHIFT 18
> > +#define ACPI_PIPE_ID_MASK (7 << 18)
> > +#define ACPI_DEVICE_ID_SCHEME (1ULL << 31)
> > +
> > +static u32 acpi_display_type(struct intel_connector *connector)
> > +{
> > + u32 display_type;
> > +
> > + switch (connector->base.connector_type) {
> > + case DRM_MODE_CONNECTOR_VGA:
> > + case DRM_MODE_CONNECTOR_DVIA:
> > + display_type = ACPI_DISPLAY_TYPE_VGA;
> > + break;
> > + case DRM_MODE_CONNECTOR_Composite:
> > + case DRM_MODE_CONNECTOR_SVIDEO:
> > + case DRM_MODE_CONNECTOR_Component:
> > + case DRM_MODE_CONNECTOR_9PinDIN:
> > + case DRM_MODE_CONNECTOR_TV:
> > + display_type = ACPI_DISPLAY_TYPE_TV;
> > + break;
> > + case DRM_MODE_CONNECTOR_DVII:
> > + case DRM_MODE_CONNECTOR_DVID:
> > + case DRM_MODE_CONNECTOR_DisplayPort:
> > + case DRM_MODE_CONNECTOR_HDMIA:
> > + case DRM_MODE_CONNECTOR_HDMIB:
> > + display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
> > + break;
> > + case DRM_MODE_CONNECTOR_LVDS:
> > + case DRM_MODE_CONNECTOR_eDP:
> > + case DRM_MODE_CONNECTOR_DSI:
> > + display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
> > + break;
> > + case DRM_MODE_CONNECTOR_Unknown:
> > + case DRM_MODE_CONNECTOR_VIRTUAL:
> > + display_type = ACPI_DISPLAY_TYPE_OTHER;
> > + break;
> > + default:
> > + MISSING_CASE(connector->base.connector_type);
> > + display_type = ACPI_DISPLAY_TYPE_OTHER;
> > + break;
> > + }
> > +
> > + return display_type;
> > +}
> > +
> > +void intel_populate_acpi_ids_for_all_connectors(struct drm_device *drm_dev)
>
> Plase use intel_foo_ prefix for functions in intel_foo.c,
> i.e. intel_acpi_ here. Say, intel_acpi_device_id_update() or something.

Done.

>
> Please always prefer struct drm_i915_private *i915 over struct
> drm_device * pointers in i915 code.

Done

>
> > +{
> > + struct intel_connector *connector;
> > + struct drm_connector_list_iter conn_iter;
> > + u8 display_index[16] = {};
> > + u32 device_id, type;
> > +
> > + /* Populate the ACPI IDs for all connectors for a given drm_device */
> > + drm_connector_list_iter_begin(drm_dev, &conn_iter);
> > + for_each_intel_connector_iter(connector, &conn_iter) {
> > +
>
> Superfluous newline, the device_id and type local vars could be here as
> in the original.

Done.

>
> > + device_id = acpi_display_type(connector);
> > +
> > + /* Use display type specific display index. */
> > + type = (device_id & ACPI_DISPLAY_TYPE_MASK)
> > + >> ACPI_DISPLAY_TYPE_SHIFT;
> > + device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;
> > +
> > + connector->acpi_device_id = device_id;
> > + }
> > + drm_connector_list_iter_end(&conn_iter);
> > +}
> > diff --git a/drivers/gpu/drm/i915/display/intel_acpi.h b/drivers/gpu/drm/i915/display/intel_acpi.h
> > index 1c576b3fb712..8f6d850df6fa 100644
> > --- a/drivers/gpu/drm/i915/display/intel_acpi.h
> > +++ b/drivers/gpu/drm/i915/display/intel_acpi.h
> > @@ -6,12 +6,18 @@
> > #ifndef __INTEL_ACPI_H__
> > #define __INTEL_ACPI_H__
> >
> > +#include "intel_display_types.h"
> > +
>
> Please prefer forward declarations over adding new includes.
>
> struct drm_i915_private;
>

Done.

> > #ifdef CONFIG_ACPI
> > void intel_register_dsm_handler(void);
> > void intel_unregister_dsm_handler(void);
> > +void intel_populate_acpi_ids_for_all_connectors(struct drm_device *drm_dev);
> > #else
> > static inline void intel_register_dsm_handler(void) { return; }
> > static inline void intel_unregister_dsm_handler(void) { return; }
> > +static inline void
> > +static inline void
>
> Whoops.

Done.

>
> > +intel_populate_acpi_ids_for_all_connectors(struct drm_device *drm_dev) { }
> > #endif /* CONFIG_ACPI */
> >
> > #endif /* __INTEL_ACPI_H__ */
> > diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c b/drivers/gpu/drm/i915/display/intel_opregion.c
> > index 969ade623691..f5976a6ab3c4 100644
> > --- a/drivers/gpu/drm/i915/display/intel_opregion.c
> > +++ b/drivers/gpu/drm/i915/display/intel_opregion.c
> > @@ -35,6 +35,7 @@
> > #include "display/intel_panel.h"
> >
> > #include "i915_drv.h"
> > +#include "intel_acpi.h"
> > #include "intel_display_types.h"
> > #include "intel_opregion.h"
> >
> > @@ -242,29 +243,6 @@ struct opregion_asle_ext {
> > #define SWSCI_SBCB_POST_VBE_PM SWSCI_FUNCTION_CODE(SWSCI_SBCB, 19)
> > #define SWSCI_SBCB_ENABLE_DISABLE_AUDIO SWSCI_FUNCTION_CODE(SWSCI_SBCB, 21)
> >
> > -/*
> > - * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
> > - * Attached to the Display Adapter).
> > - */
> > -#define ACPI_DISPLAY_INDEX_SHIFT 0
> > -#define ACPI_DISPLAY_INDEX_MASK (0xf << 0)
> > -#define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4
> > -#define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4)
> > -#define ACPI_DISPLAY_TYPE_SHIFT 8
> > -#define ACPI_DISPLAY_TYPE_MASK (0xf << 8)
> > -#define ACPI_DISPLAY_TYPE_OTHER (0 << 8)
> > -#define ACPI_DISPLAY_TYPE_VGA (1 << 8)
> > -#define ACPI_DISPLAY_TYPE_TV (2 << 8)
> > -#define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8)
> > -#define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8)
> > -#define ACPI_VENDOR_SPECIFIC_SHIFT 12
> > -#define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12)
> > -#define ACPI_BIOS_CAN_DETECT (1 << 16)
> > -#define ACPI_DEPENDS_ON_VGA (1 << 17)
> > -#define ACPI_PIPE_ID_SHIFT 18
> > -#define ACPI_PIPE_ID_MASK (7 << 18)
> > -#define ACPI_DEVICE_ID_SCHEME (1 << 31)
> > -
> > #define MAX_DSLP 1500
> >
> > static int swsci(struct drm_i915_private *dev_priv,
> > @@ -662,54 +640,12 @@ static void set_did(struct intel_opregion *opregion, int i, u32 val)
> > }
> > }
> >
> > -static u32 acpi_display_type(struct intel_connector *connector)
> > -{
> > - u32 display_type;
> > -
> > - switch (connector->base.connector_type) {
> > - case DRM_MODE_CONNECTOR_VGA:
> > - case DRM_MODE_CONNECTOR_DVIA:
> > - display_type = ACPI_DISPLAY_TYPE_VGA;
> > - break;
> > - case DRM_MODE_CONNECTOR_Composite:
> > - case DRM_MODE_CONNECTOR_SVIDEO:
> > - case DRM_MODE_CONNECTOR_Component:
> > - case DRM_MODE_CONNECTOR_9PinDIN:
> > - case DRM_MODE_CONNECTOR_TV:
> > - display_type = ACPI_DISPLAY_TYPE_TV;
> > - break;
> > - case DRM_MODE_CONNECTOR_DVII:
> > - case DRM_MODE_CONNECTOR_DVID:
> > - case DRM_MODE_CONNECTOR_DisplayPort:
> > - case DRM_MODE_CONNECTOR_HDMIA:
> > - case DRM_MODE_CONNECTOR_HDMIB:
> > - display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
> > - break;
> > - case DRM_MODE_CONNECTOR_LVDS:
> > - case DRM_MODE_CONNECTOR_eDP:
> > - case DRM_MODE_CONNECTOR_DSI:
> > - display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
> > - break;
> > - case DRM_MODE_CONNECTOR_Unknown:
> > - case DRM_MODE_CONNECTOR_VIRTUAL:
> > - display_type = ACPI_DISPLAY_TYPE_OTHER;
> > - break;
> > - default:
> > - MISSING_CASE(connector->base.connector_type);
> > - display_type = ACPI_DISPLAY_TYPE_OTHER;
> > - break;
> > - }
> > -
> > - return display_type;
> > -}
> > -
> > static void intel_didl_outputs(struct drm_i915_private *dev_priv)
> > {
> > struct intel_opregion *opregion = &dev_priv->opregion;
> > struct intel_connector *connector;
> > struct drm_connector_list_iter conn_iter;
> > int i = 0, max_outputs;
> > - int display_index[16] = {};
> >
> > /*
> > * In theory, did2, the extended didl, gets added at opregion version
> > @@ -721,20 +657,12 @@ static void intel_didl_outputs(struct drm_i915_private *dev_priv)
> > max_outputs = ARRAY_SIZE(opregion->acpi->didl) +
> > ARRAY_SIZE(opregion->acpi->did2);
> >
> > + intel_populate_acpi_ids_for_all_connectors(&dev_priv->drm);
> > +
>
> As the acpi_device_ids will be used elsewhere too, maybe this call needs
> to be moved to a higher level and called on the resume path. *shrug*

I don't understand this code well, happy to do whatever you or others
see fit. I kept it here so as to not to disturb any code that I do not
understand and cause unintended regressions (this code had it here, so
decided to leave it as-is). For the privacy screen purposes, we just
need to know the ACPI ID before we probe for the privacy screen to add
the property.

Thanks,

Rajat




>
> BR,
> Jani.
>
> > drm_connector_list_iter_begin(&dev_priv->drm, &conn_iter);
> > for_each_intel_connector_iter(connector, &conn_iter) {
> > - u32 device_id, type;
> > -
> > - device_id = acpi_display_type(connector);
> > -
> > - /* Use display type specific display index. */
> > - type = (device_id & ACPI_DISPLAY_TYPE_MASK)
> > - >> ACPI_DISPLAY_TYPE_SHIFT;
> > - device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;
> > -
> > - connector->acpi_device_id = device_id;
> > if (i < max_outputs)
> > - set_did(opregion, i, device_id);
> > + set_did(opregion, i, connector->acpi_device_id);
> > i++;
> > }
> > drm_connector_list_iter_end(&conn_iter);
>
> --
> Jani Nikula, Intel Open Source Graphics Center

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